Waking Up Sore

My back has been so sore lately. I wake up feeling like I've been sleeping on a 20 year old mattress. Dan discovered the reason last night. I sleep on my stomach and it seems that our 13 pound cat, Zac, has started sleeping on my back at night. Dan came to bed late last night and said Zac was stretched out on his side right on top of me. No wonder I wake up hurting all over. Crazy cat. When we adopted him, I said I wanted a cat that would snuggle with me, but that's not quite what I had in mind!